161314381 has 2 divisors, whose sum is σ = 161314382. Its totient is φ = 161314380.

The previous prime is 161314379. The next prime is 161314423. The reversal of 161314381 is 183413161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91508356 + 69806025 = 9566^2 + 8355^2 .

It is a cyclic number.

It is not a de Polignac number, because 161314381 - 2¹ = 161314379 is a prime.

It is a super-2 number, since 2×161314381² = 52044659034826322, which contains 22 as substring.

Together with 161314379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161314301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80657190 + 80657191.

It is an arithmetic number, because the mean of its divisors is an integer number (80657191).

Almost surely, 2^161314381 is an apocalyptic number.

It is an amenable number.

161314381 is a deficient number, since it is larger than the sum of its proper divisors (1).

161314381 is an equidigital number, since it uses as much as digits as its factorization.

161314381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 161314381 is about 12700.9598456180. The cubic root of 161314381 is about 544.3660456768.

The spelling of 161314381 in words is "one hundred sixty-one million, three hundred fourteen thousand, three hundred eighty-one".